"Sources familiar with the ongoing negotiations between Apple and Microsoft tell AllThingsD that the companies are at loggerheads not over the 30 percent commission Apple asks of storage upgrade sales made through SkyDrive, but over applying that same commission to Office 365 subscriptions sold through Microsoft Office for iOS, which is expected to launch sometime next year." iOS could end up being the only mobile platform without Office.

Offer Content to New and Existing SubscribersIf you offer auto-renewable subscriptions, you can also use other methods to acquire digital subscribers outside of your app. You can sell digital subscriptions on your website or provide free access to content for existing subscribers. In these cases there is no revenue sharing since Apple was not involved in the transactions. Developers keep 100% of the revenue. If you would like to make a subscription offer outside of the app, the same (or better) subscription price must be offered inside the app for users who wish to subscribe from within the app. In addition, you may not provide links in your apps which allow the customer to purchase content or subscriptions outside of the app.